ESX QS-FOUR

ESX Quantum Series

Following the great success of the sensationally small 2-channel power amplifier QS-TWO (only 90 x 35 x 70 mm), ESX set itself the goal of developing an equally small but powerful 4-channel version. With the brand new QS-FOUR, this ambition has now become reality: the ultra-compact 4-channel power amplifier is now available - and is only 10 mm wider than the 2-channel model. With an impressive 4 x 60 watts RMS on just 90 x 35 x 80 mm, it sets new standards in the nano amplifier sector.

Many people ask themselves: Why so small? The answer is simple: mini power amplifiers can be installed directly in the dashboard as Plug+Play ISO versions. Simply connect the cables - and the front and rear speakers are supplied with power, including the power connection. The special feature: In vehicles with an ISO connection, everything is already prepared so that no additional power cable needs to be laid. The QS-FOUR is perfect for this. Thanks to its impressive efficiency of up to 90%, it only requires 5 to 10 amps of continuous current when listening to music - an output that the factory power cables can easily cope with.

If you want more bass, that's no problem either: the QS-FOUR has special low-level outputs that can be used to drive active subwoofers such as the Q168A, Q201A or HZ800A. These outputs can also drive larger monoblocks such as the QL500.1 or QL750.1, which can be used if you want to install separate subwoofers.

Once connected, the QS-FOUR will amaze you. Because in most cases, the factory speakers are much better than you think. This is often due to the built-in radios, which simply deliver too little power. If you want to listen to louder music, the speakers will "scratch". If you then think it's the speakers, you're wrong. Because the supposed "scratching" usually comes from the amplifier installed in the radio, which is at its limit.

In this full-load mode, the amplifier distorts. This is known as "clipping". An additional amplifier always provides a remedy here. However, these are often very large and have to be connected to the battery with power cables as thick as your thumb. ESX has developed the QS-FOUR for precisely this purpose, which, with up to 4 x 60 watts RMS, delivers 4-6 times as much power compared to conventional radio amplifiers. And all this with very low power consumption, the lowest distortion factor and the latest Class D technology.

The Nano amplifier is also available as an ISO version.


Features:

✓ Efficient Class D amplifier with ultra-compact dimensions
✓ Heavy cast heat sink with optimum cooling properties
✓ Automatic power-on function
✓ High-level inputs with Error Protection System (EPS)
✓ Start/Stop Ready
✓ RCA inputs (via Molex)
✓ Stereo RCA output for e.g. active subwoofers
✓ HPF/LPF switchable
✓ Perfect for HD Audio


Technical data:

4-channel Class D Nano Digital amplifier

4 x 60/45/35 Watt RMS @ 4/3/2 Ω

2 x 120 Watt RMS @ 4 Ω bridged

HPF/LPF @ 80 Hz

Distortion factor THD+N @ 5W/RMS < 0.007%

Frequency range 10 Hz to 60 kHz

Dimensions 90 x 35 x 90 mm

Efficiency up to 90%


Instruction manual
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Test report
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